MCQ
An elements in $+3$ oxidation state has the electronic configuration $(Ar)3{d^3}$. Its atomic number is
  • $24$
  • B
    $23$
  • C
    $22$
  • D
    $21$

Answer

Correct option: A.
$24$
a
It’s Obvious.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Which of the following derivatives of alcohols is unstable in an aqueous base $?$
$\begin{array}{*{20}{c}}
  O \\ 
  {||} \\ 
  {H - C - Cl} 
\end{array}$ is called
Consider the following four compounds $I, II, III,$ and $IV$.

Choose the correct statement($s$).

$(A)$ The order of basicity is $II > I > III > IV$ .

$(B)$ The magnitude of $p K_{ b }$ difference between $I$ and $II$ is more than that between $III$ and $IV$.

$(C)$ Resonance effect is more in $III$ than in $IV$.

$(D)$ Steric effect makes compound $IV$ more basic than $III$.

The magnetic moment is measured in Bohr Magneton (BM).

Spin only magnetic moment of $Fe$ in $\left[ Fe \left( H _2 O \right)_6\right]^{3+}$ and $\left[ Fe ( CN )_6\right]^{3-}$ complexes respectively is:

The standard $EMF$ for the given cell reaction $Zn + C{u^{2 + }} = Cu + Z{n^{2 + }}$ is $1.10\,V$ at ${25^o}C$. The $EMF$ for the cell reaction, when $0.1\,M\,C{u^{2 + }}$ and $0.1\,M\,Z{n^{2 + }}$ solutions are used, at ${25\,^o}C$ is ..........$\mathrm{V}$
What happens when $2-$ hydroxy benzoic acid is distilled with zinc dust, it gives
Maltose on treatment with dilute $HCl$ gives
Choose the appropriate product for this reaction.
The vapour pressure of water at $20\,^oC$ is $17.54\,mm$. When $20\,g$  of a non-ionic, substance is dissolved in $100\,g$  of water, the vapour pressure is lowered by $0.30\,mm$ . What is the molecular weight of the substances
Match List - $I$ with List - $II$.

${List-I }$  ${(Reactants) }$

${List-II }$  ${ Products }$

($A$)Phenol, $\mathrm{Zn} / \Delta$

$(I)$ Salicylaldehyde

($B$)Phenol, $\mathrm{CHCl}_3, \mathrm{NaOH}, \mathrm{HCl}$

$(II)$ Salicylic acid

($C$)Phenol, $\mathrm{CO}_2, \mathrm{NaOH}, \mathrm{HCl}$

$(III)$ Benzene

($D$)Phenol, Conc. $\mathrm{HNO}_3$

$(IV)$ Picric acid